Dangling references error or not?

[Bob Foster]

The following exchange took place on xml-dev yesterday. I am the guilty 
party who invoked XercesJ. In fairness to Henry, I want to know if I 
somehow turned on the reportErrorsThatArentReallyErrors switch.

------------------------------------
Hmm. XercesJ reports three errors (not warnings) from this schema of the 
form:

Error - src-resolve: Cannot resolve the name 'unknownX' to a(n) 'type 
definition' component.

Where X is one of: 1, 2, 3;
Bob Foster
Henry S. Thompson wrote:
> I'll answer a simple question which I understand, and which I _think_
> is what you're asking.
>
> The following XML document is valid:
>
> <!DOCTYPE root [
> <!ELEMENT root (a|x)>
> <!ELEMENT a (b|y)>
> <!ELEMENT b (c|z)>
> <!ELEMENT c EMPTY>
> ]>
> <root><a><b><c/></b></a></root>
>
> Note it contains no declarations for the elements x, y and z.
>
> The corresponding schema document successfully validates the same
> instance:
> [Example unquoted so you can try it yourself]
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";>
 <xs:element name="root">
  <xs:complexType>
   <xs:choice>
    <xs:element ref="a"/>
    <xs:element ref="x"/>
   </xs:choice>
  </xs:complexType>
 </xs:element>
 <xs:element name="a">
  <xs:complexType>
   <xs:choice>
    <xs:element ref="b"/>
    <xs:element ref="y"/>
   </xs:choice>
  </xs:complexType>
 </xs:element>
 <xs:element name="b">
  <xs:complexType>
   <xs:choice>
    <xs:element ref="c"/>
    <xs:element ref="z"/>
   </xs:choice>
  </xs:complexType>
 </xs:element>
 <xs:element name="c">
  <xs:complexType/>
 </xs:element>
 <xs:element name="x" type="unknown1"/>
 <xs:element name="y" type="unknown2"/>
 <xs:element name="z" type="unknown3"/>
</xs:schema>
>
> So yes, you can do incremental development of a schema for a complex
> XML language.
>
> ht
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